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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdd05f86a0d8dee3f13a4fdfd9ca11e77bb4a16ed2dfe97e2f1219be42132dc' 
  AND token = 'x9KmnQbDmZRIM1r8h+FjqPSEbYOxIq3tw/jSRZ7XqPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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