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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b5e09ffc1d88aa46e745c28ea0e64f1b93817b1aae6f7f9477a26aef4c1d26' 
  AND token = 'ASyIc6jq1tGGd7CxYVydlxRAQTnxKwJ/3svYNNWRGu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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