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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcafdadb47aef53d2a371a4d17e4cfa0092545af771a2fb5554382419a9fe16' 
  AND token = 'IIbSHcd0y1SjLlVXB7kCia+LJLt/w4DBTVzp82I2qX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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