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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e3b620446516a13e54dc8790df81abdc782db422a82cdf09e0fe4a7ac36440' 
  AND token = '3Ev/AXNZ0y2g4Eur+pCJaruJE0mXWyJM7PxeMwz6yDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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