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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bb709515f9e24883f754587836250862e1d99ca4e9eeac6c933371d21d3ccc' 
  AND token = '0TdMCnYFG1XZadpZYxO6HUsUDRHUZOcKs5MuCE/Jwdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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