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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca27a7fcbb39ab5ee76e51901b8024ea536ef694aae13df6d2927d35624a7298' 
  AND token = '/4DFA6qW657e+r08DXqC2lKGjJL0QgVgWPrklqReTyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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