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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237fa99e7f56d1f4c053c7f6a4e8624c8eb76b1d0e4a55b42bc4762153de3a9e' 
  AND token = 'i7C/Hcyes8qO/nEEx2YSBcuLI8u1ulW2ynxoOHvvPwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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