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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5592a1dbf569deeccfeb3c28899d8e8513577af6ecf9ced481aa898deed8d58' 
  AND token = 'O+KR6GaFo01qwF/ryaIFAmyXG/DCeR8xriBPDLU+klU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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