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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bbb85f368a8c4c4e4edd843485474cdc5e94291e4634e1a315c1dd5363ce8b' 
  AND token = 'F2kpbgm6HPki4iYQ/8yliZYMGnWUmE9L+AOHuLgDV4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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