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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5692e02b071398661967e6b4e1ebfec17a0d56113cbabc2b7336f727bf3151' 
  AND token = 'SjJUKxABqDk6AmnX9+pp/Q1dxYQWEV79jrhgbve9Cog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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