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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a16d2b576a55f2070653fdfb6e98a0d3c92635aa1801557364c450a8ce3ab1' 
  AND token = 'OjicF1UbEg9HJArVO0JGu6uUhaTcU+t4TrVO75f1rVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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