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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2dcbd28b66ce011e9372bedf809b3b9fda43a9c2da2afaba1aed3cdc84bae3' 
  AND token = 'f5Wa3E8skimXrijW4vyPPXCEYOoR7V6039QiT/rAzeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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