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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73441f90146e1ebb185618eb1c96581ac203b57f484e8103e49d418fddce2920' 
  AND token = 'uJoOsV4CI4XsmipbsMOKxCbIDhw0+X1bF9vQNAenRW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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