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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009cbece5e542ede13bb2ae888371b9c53aaf0b64a61830b2d37d0e8166d258c' 
  AND token = '3FfbBHHcPeIa0/SZVI0kwoX4cvbGcgLfAEf2afoHjwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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