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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb56c2d928bf736b94d3020fa0a035938fc69c99a132160ed5b752c4111882e' 
  AND token = 'ebZ9M++B/D7H0mww8CYdcOddifM5hJ51adXMdzgGGXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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