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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4a29627df8ad1b2c243b69a81a304ac7651f32ce75ab845aac63d8470c0e89' 
  AND token = 'i1uOyO/5/BsYfJcSXTYctv0bMjaAmxv8I0uRCOLfIuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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