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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bc5f40c6c71e61d0e2ee5397217b100bf7c4ecebae79feb6a6e8eaca3b18f6' 
  AND token = 'm5A4r1Al25xMj17oi7+kwCsLDEcJXElaOzK1cpADcGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}