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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8984ee77666762c368a863718c22f6b5f44ff7811a1302ceca218bccd5ea8185' 
  AND token = 'TYaXn03lR6KkMVC9SQ7xLpX6T7VMmh3SXw0B/FiL0qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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