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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24313b8319c37da44af7e04a369af0b90521b696126c6f49b01d55aad278ac30' 
  AND token = '6lWXh6Qoi7M2jSgfDGG6pT9SK7sICigXtYn4brp6HU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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