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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33e2fdf1bad2f6e218e8936ff055dc1dd0175e9a6e0c3d6ef5bb3dbca97b113' 
  AND token = '7DeQqBQG19mm52CEpUz1lM1pfCp1eu3RkRv+JOmeDPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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