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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cea8446b59d64f411bf4067d1522ed5639d7895865897aeff7e87a79b54c05' 
  AND token = 'L7xfiX1gzc715lEue7BEPK+uZyv1kiDax2FPrf6mcmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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