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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d457d30c95b963e8cb0c3b6c186ca4d44e131863e7ea5cd0feba95fbcc0b08' 
  AND token = 'fj5QKg/Gvx8Nqw/HuoPvjDnKemudH7JVyi2IugRDyuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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