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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd2c90243bd61ba5838a927cdf97c793bcbbc4f0b19706df0a6d46275743ed0' 
  AND token = 'cQNzFAm4D0LFuAsxA4BmHYkcOX8EWtuNdHNukDC+414=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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