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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f682406fb7885148d591083d87da101e7d66918904c0491bdab207599c787d55' 
  AND token = 'sn+jUOWQ9KUtz6clnNSN06wP0ZDxTJbubeJqzn2ovso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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