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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2066d9ce58f32945e0e310ecaaaeefd65a211265e235458ab2095682245ea6' 
  AND token = '1amlmaxlldkzTEFZ/LGhtDqz29q1DH1XMV03gtAwTeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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