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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abe81aa51b1587f66d7b00f7e8e6d809e75172a7d9939df7f373ad5f700fd45' 
  AND token = '0uKUwrNO12/BC85cDMiIEJQJUK3tFPs9cNrQHoGfV40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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