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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08769a2d3442585158a5c2e881a1aab827c484907331481e33433c5a9e9c2527' 
  AND token = 'OTxar2z+hFvLqBcEzn0Qz8ty0yjDrObNa3iD+seRRlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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