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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9ee39e18956445e77648e8f9d37f21e59142cbb097cc39a4e609360cb3f011' 
  AND token = 'o9sVioFyHmRtbPy43z1K0UCvl/BKJDJRrWYRI33gp+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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