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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3076d85fb2f085db08e43ac9332911dfe4eb7303787a07cbc5bcedf015132232' 
  AND token = 'ojqZkPniMMfzCUwbnGwv2klW2mihBgdMIEDgfWqzNDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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