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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f74c90c33e0309e88c0d5feee3eccca5f1ae0f81e9c35f803d8ea81e63050c' 
  AND token = '1glQqV+BYcFW7aY95C0JXl61FlfB9wgfSH89wy47sHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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