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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e74e8426160cdb6ef90199c06c1edf40c217d73cec31672d665ec701fa390a1' 
  AND token = 'gHVy9Etzea1UymBLvEqQPEGfPM3h/hPFpODbZ4pjWtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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