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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9caa3407cea91eef0c6f49a3a8107559cfb4d26e5c5427f9aca98d9d2a94cde3' 
  AND token = 'uXM39RDUX+tMki4r0sH3kb6N/80fpJMP7GuSgH4lptc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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