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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '222a82f659a06831e712c4c63751e49fb4b3c410cd720645bce3a614231cd32a' 
  AND token = 'e94UvL6eA7lr5clHfJCyv0H5TupJ9iw6Yq/UGaTVMVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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