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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ead2b592ac5b1646cc16ec00195e2a96d84b4ae60f70a4ada848bfc89014f70' 
  AND token = 'TpmHI4ZZdoYvMJUELu1iC+AnYa2L/YdCBjxAe3FZhhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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