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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85ab312f0aef28cbd0f4701218bce8d31557251ec02d65d1450c1ffa8ffaed2' 
  AND token = '4gHtQmITuSXylhB2bO04Rl0Bjf++F+Hx16UX1CWdo0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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