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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cf7ec742f9df02a658b51f5cff1c4a6ba7605dbca05997f64e7f276f4ee442' 
  AND token = 'uJ6yKVFEnuD58agx7p9SSxKnODrTPh9ucV91eqm8oW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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