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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69acb803455e44fe6a5600c87efcd88696375194b7f95ce5e1233c311063b435' 
  AND token = 'uu6TdPCe5iE39okO5End7Dv5lPSkCyPRpOcv4NbMpyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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