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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075f999ac792c65e1bb49ba6abd2b23dfab15fcdd7d8c69c7640bc92f251b522' 
  AND token = 'fQ56dE6zGKvw9xtBo924n1f5314sRkT38z/Y7Vqk7ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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