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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e082fe4e5f2309f51d5273754235de641068f814b7f165239589b37ea0a374bb' 
  AND token = 'BYLms8CC8sjI44f9nsLUHoN9+Whj1D63UP4qmkBCHuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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