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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d7ef3ded9e380694e484f7ec0129fbe9c73b5181dd86075657e0cb67a7f1a6' 
  AND token = '6Zrlys6gfza2dNrFXkaKqgnffE4D+fB9U3K4zFqluFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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