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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a397c5979f87d0f0ec096d8a3ea515526787c13e5d24b2b9710222edd262031' 
  AND token = '7GhMF3C/fvCKojrss/6xOWqlVplV7+0T044t77wnNuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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