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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25885a8e1cab6400e1d1caae462cc9bddf9529cf335c88a8b69affdb64549b6' 
  AND token = '0Y5TEMwZJtqwrdCoxi8zNCobBo2u9m+pILaREZMEoMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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