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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2826ed87a1f7ec94b3cb75d6f8b4d7e7d4037648846574878432b927f4c3a59d' 
  AND token = '4LCroZTcuoSqgN8gGplka8RhOwDGOmyVTGJ2Bs62e8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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