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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2e448c211521758d6d9d5124b8107556c762ceebaac5ca03b6c5499d546a7a' 
  AND token = '5zQuS9MS1Tn33yAIcJEAxi1stl9IcGeP2NhFOz1PyI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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