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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b309ccce4ced48a9bf5d7dacac1415f38ac1cdfeb7af8eec70bbe4c20ce2db53' 
  AND token = '7pqDi3MFbpHu2pEH4rOHBVPQLRHcLPhplkkZEG1icXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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