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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7684b182e0339a515322a83e39b23a67905907830eacbb3168bac7f02b6fa49b' 
  AND token = '1RdLxUrR4/63qRDx702HiQmjjR4hk3Q/J74J74JNSJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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