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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dababaf5f695145719061e4b1fc48b828676dff9781314717be3c6fa459e0bac' 
  AND token = '8VtYZngCgPETI7u0ITnoUb3X0P5Sl1UeFv7xl8BNo+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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