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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8f2abe8cb6acddfd46152a7c4181712869cf16d25711f80e98a5a58e1705a4' 
  AND token = 'A386+ebL5lE5pLy2I8kY97vx//zYXH8F7KalAC95iBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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