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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb01c32b57a56a0851ae79b4904e617be59f64cbb1ab3e4085771fd6e9d15ab1' 
  AND token = 'joXvI12JxgzA7oFTpTx5LtV0L9vhMNWngZTMA+MYUXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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