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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd184ee5777fbd28b5386e4850b22b6035ee04fba996e57e7a1eb1ae025d84ff0' 
  AND token = 'sBPNRc4Zc0/RBkxNsryKr5uN2xF169CZX2Q3ExXU5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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