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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f21d7511efbe47f81d5446c11ffd0e80671fa993ac5770a64940ed8a2da15b4' 
  AND token = 'UvnBl/xvfQqCQIMw4KfO3HuEWJ0VcpOif3fU7JZHabs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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