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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bec1800bc5fb62f70c7a03e9a20430c9b88cf2a3c81a4a6b33d5795f1100154' 
  AND token = '9nRQLkG4e+tR0/ip5mvc2tySnHU2Y+zhc34tazM+BKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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