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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de07e4048c8439a9b49e883fe26a6669b897d1a1cb1d4a2331fdc4e95479b032' 
  AND token = 'FbCcCj0pTW6M1m0CfTgMl54ujwzlr7pbIpBz1DgRXYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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