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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e49e602f758953f6bef695a3fb355f37f9f3e8f2ec7fbef8b0a86a8d36663e' 
  AND token = 'fzMq7TnUzH6opiwDiRKilKlyD37eHHBlfnbajQUJPxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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