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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a298d9e389eca6a33b21a189da58a776923291648cab2d9f4622de672d94a758' 
  AND token = 'd3QOQLIwdGKbn12vV1RzjsoHLLFS8LMfnylll78t1Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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