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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278f30e72e2d0a33955043dc633505a517272d7dbe22d80eb041aead74c49d58' 
  AND token = 'b3m+TtEfGe43QlTcNKhhsQM1QfKTZ8l3aQakmaCaIfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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