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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee464eb548619e42193ee65b00844f84c41d32ab6a438089b9d024e73cee7677' 
  AND token = '8LZ6+s91m+37m4JRXRC9tqcwlA7XarRWoQgwnSzup3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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