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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfddf8211e61d07df0b7c6125cdd68b78a2abdbd0e1eee92098ad2f2db16880b' 
  AND token = 'j74+JkIxkwr4+QQN9X6IogcDrRLlqnwqJEa+bXqx9HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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