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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdf42f0ad0f6e77a11e6c1b5105b835419609ccbf7c74c6dfd0206bd31f6eff' 
  AND token = 'HwuXIfJNl8wuMQDvNkGHMEA13mmIhEXuXUJiqQJsHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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