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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052ea8ecdc1061b3c839ae56ad0b80836155add40af52b26dab06f89284851ed' 
  AND token = 'BBr+gQ5RzYgikXlLsDHzUmpxet3jYBQNigpDN1UlXYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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