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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd7cad2b7948a31de541e0d283523818584afbb99c21017062b2a5daa05f205' 
  AND token = '63x6m2lVsgtCLQgEvv2yXoP/BV04tWl6KpV3LeWz+E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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