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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69246bf9db7823e4486f6dd8697f9b5488f145a74fb303d8b67c385597af60e9' 
  AND token = 'w79iw0jIEdNkGDY07J97sdVMuhApmSqjeUiQM/K2Eqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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