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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3affaef108710818af8182134f7487fa41137c285b2534d4832f0db89c1b32d' 
  AND token = 'IjOpRlE4B5JxKtgo6fHeMqQpkwx13NdXXpUwhJ6yiXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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