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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f3eac2d6afe976a1b6e1c35468cec85cafb265f00ff01ffae7feb08bc62e59' 
  AND token = 'dAJHd4Cjamz5Afn+BPpAIiLcITF/3jW15VGoXg01qZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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