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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e9366feb7107b326b6234186a25e860b0eb576fd23326c85be3cb7449cbafe' 
  AND token = 'xfb9bKP9RSQlWTPMAKNrDXVJETbxgsoEApe7BYeDwxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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