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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49f2a5046262bd9dc2e951f71e5bd0b3c6f54c5c4face01b7a403048ba2d24f' 
  AND token = 'yQlSgFo27Gncgfda5V45s0mHNQaeDTzGuNzjGOuwINs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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