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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a39dd40117cd9e026970567ee7a33a7f947660dfc5e7258ed5d8d5be7c560e0' 
  AND token = 'gH55N63xuly1c5BbECYxGlJ4rwtCkPvVtMjQgrcpmYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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